Merge pull request #1 from rvesse/master

Assorted Script Enhancements

- add possibility to generate icons in different sizes 
- add parameter to scripts / commands
Grouping icons in README.md to have a better overview. Additionally add few comments

- use a function to group icons in README.md
Small improvements in README.md
Add icons for n-triple (3) and rework terms icons
Add text about sizes to README.md
Add svg files to archives too